At the reverse movement of the membrane chamber volume decreases, and milk, pressing valve, enters the pipeline. Intake valve closes at the same time and prevents leakage of fluid. Liquid supply pump is so uneven, pulsing flow. This disadvantage is reduced pumps with double camera. Suction head diaphragm pumps up to 5 meters, and created pressure – 250 kW. To implement the suction and discharge strokes of the diaphragm pumps with pneumatic used excessive air pressure or vacuum.

In the first case, the pump consists of a body, a membrane cover, valve and air distribution devices and control the operation of the pump. Due to the simplicity of the drive unit and a uniform Effects of air on a membrane with a slight mechanical effect on the liquid diaphragm pumps with a pneumatic actuator is widely used in chemical, food, oil and gas processing industry. With some technological processes of processing fluid should be submitted to the executive mechanism under high pressure. In this case, the high-pressure plunger pumps. Pump High-pressure-driven consists of the motor housing with a crank mechanism, one, two or three plunger, hydraulic unit and auxiliary equipment. Injection pressure reaches 20 MPa during the plunger of 20 mm. Rotary, or rotating, pumps are positive displacement pump type. This gear pumps with external and internal gears, rigid and flexible rotor, screw pumps and special, for Most of the pumping of viscous products such as displacement pumps should be used in continuous process lines, as they wash a lot of effort and leads to significant losses of the pumped products.